| JG Virtual Assistant Ltd | Administrative & support | 2022 |
| Jimko Ltd | Professional & scientific | 2025 |
| Jitesh Holdings Ltd | Wholesale & retail | 2020 |
| JJ Social Work Consultancy Limited | Health & social care | 2025 |
| Jjmj Property Ltd | Real estate | 2024 |
| JK Maintenance Ltd | Administrative & support | 2014 |
| JL Coaching Ltd | Construction | 2025 |
| JM3VZ Limited | Real estate | 2018 |
| JMD Property Group Ltd | Real estate | 2020 |
| JMR Bros Ltd | Real estate | 2023 |
| JMT Concierge Ltd | Transport & logistics | 2026 |
| JN Global Limited | Construction | 2016 |
| JN VV Windows Ltd | Construction | 2018 |
| Joiner Xpert Ltd | Construction | 2024 |
| Josjin IT Limited | Information & communication | 2021 |
| Jouas Limited | Hospitality | 2022 |
| JPA Projects Limited | Real estate | 2019 |
| JPC Lockup Limited | Real estate | 2021 |
| JPH and Associates Limited | Professional & scientific | 2019 |
| JR & Daughters Ltd | Real estate | 2020 |
| JRG IT Consulting Limited | Information & communication | 2011 |
| JS & Daughters Property Management Ltd | Real estate | 2020 |
| JSK Supermarket Limited | Wholesale & retail | 2025 |
| Jskk Ltd | Wholesale & retail | 2024 |
| JSM Atauk Ltd | Real estate | 2020 |
| JSM Education Ltd | Education | 2026 |
| JSM J5UK Ltd | Real estate | 2024 |
| Jsrodrigues Limited | Professional & scientific | 2025 |
| JT Heritage Realty Ltd | Real estate | 2025 |
| Jubilee Court Carshalton Management Company Limited | Real estate | 2002 |
| Jungle BEE Ltd | Construction | 2019 |
| Junior’S Electrical Ltd | Construction | 2025 |
| Just SAY Decor Ltd | Wholesale & retail | 2018 |
| JV & KT Investment Ltd | Real estate | 2021 |
| JV Brothers Properties Ltd | Real estate | 2017 |
| JVM Property Investments Ltd | Real estate | 2019 |
| JY Mart Ltd | Wholesale & retail | 2024 |
| Jykhz Ltd | Real estate | 2026 |
| K Kleaners Ltd | Administrative & support | 2025 |
| K T Electrics (UK) LLP | | 2007 |
| K&A Retail Ltd | Wholesale & retail | 2026 |
| K&A Building Construction Ltd | Construction | 2016 |
| K&S Events Ltd | Hospitality | 2019 |
| K..Khan.& Sons Ltd | Hospitality | 2018 |
| Kaas Trades Ltd | Wholesale & retail | 2019 |
| KAL Building Limited | Construction | 2008 |
| Kalel Men's Grooming Ltd | Other services | 2025 |
| KAP Connect Ltd | Real estate | 2025 |
| Karoop Business Solutions Limited | Information & communication | 2009 |
| Karthyroshan Limited | Real estate | 2025 |
| Kashifa's Multinational Limited | Wholesale & retail | 2017 |
| Kashnad Properties Ltd | Real estate | 2025 |
| Kasi Build Ltd | Construction | 2022 |
| Kasi's Food Services Ltd | Hospitality | 2025 |
| Kasina Ltd | Professional & scientific | 2019 |
| KAT Knight Consultancy Ltd | Professional & scientific | 2018 |
| KAY & Trouw Associates Limited | Administrative & support | 2010 |
| Kaydalee Consultant Limited | Professional & scientific | 2014 |
| KCW & Sons Limited | Professional & scientific | 2010 |
| KD Cafe Ltd | Hospitality | 2019 |
| KD FIX Limited | Construction | 2016 |
| Kenwood Enterprise Limited | Real estate | 2025 |
| Kenyons Estate Agents Limited | Real estate | 2011 |
| Kenzo Services Ltd | Wholesale & retail | 2022 |
| Keogh FM Ltd | Professional & scientific | 2010 |
| Kerry Research and Selection Ltd | Administrative & support | 2022 |
| Kesari Nandan Limited | Wholesale & retail | 2025 |
| Keshav Parth Ltd | Wholesale & retail | 2026 |
| Keystone Connections Ltd | Construction | 2026 |
| KFW Accountancy Ltd | Professional & scientific | 2018 |
| Khatrys Properties Ltd | Real estate | 2022 |
| Khii Traders Ltd | Wholesale & retail | 2026 |
| Kimstates Ltd | Wholesale & retail | 2023 |
| Kingfisher Joinery Ltd | Manufacturing | 2018 |
| Kins Barber Carshalton Limited | Other services | 2023 |
| Kiran Emporium Ltd | Wholesale & retail | 2025 |
| Kireetha Ltd | Administrative & support | 2016 |
| KJ3 Global Ltd | Professional & scientific | 2019 |
| KJB Sales Ltd | Wholesale & retail | 2025 |
| KJC Architects Ltd | Professional & scientific | 2015 |
| Kjdjg Limited | Professional & scientific | 2021 |
| KJJ Consultants Limited | Construction | 2014 |
| KMW Real Estate Ltd | Real estate | 2019 |
| Knightshade Limited | Real estate | 2000 |
| KNK Engineering Services Ltd | Construction | 2025 |
| KNS Building Services Ltd | Construction | 2025 |
| Koala Landscapes and Construction Ltd | Administrative & support | 2020 |
| Kongo Security Ltd | Administrative & support | 2021 |
| Kovalent Technologies Ltd | Information & communication | 2026 |
| KPF Investments & Consulting Ltd | Professional & scientific | 2010 |
| KPN Properties Investment Ltd | Real estate | 2016 |
| KRI & Sisters Real Estates Ltd | Real estate | 2025 |
| Krisaro Ltd | Agriculture & fishing | 2025 |
| KT Accounting Ltd | Professional & scientific | 2023 |
| KTF CAB Limited | Transport & logistics | 2025 |
| KTF Group (UK) Limited | Wholesale & retail | 2016 |
| Kukie Limited | Extraterritorial | 2011 |
| Kung FU Schools (Sutton) LLP | | 2011 |
| KW Aviation Limited | Administrative & support | 2006 |
| L a Dogs Limited | Professional & scientific | 2014 |